#include <vector>
#include <iostream>
using std::vector;
using std::cout;

int main() {
    // Initial Vector
    vector<int> v={3,2,3,5,6};
     
    // Print the contents of the vector
   for (int i = 0; i < v.size(); i++) {
      cout << v[i] << " ";
    }
    
    // Push 4 to the back of the vector
    v.push_back(4);

    cout<<"\n";
    // Print the contents again
    for (int i = 0; i < v.size(); i++) {
      cout << v[i] << " ";
    }
    
}